APO cron with oil on aperture blades

[jakontil]

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9 hours ago, Stein K S said:

Any hidden message I do not grasp…?

The heat of the sun will break the lens vein that leads to leakage, hence the oil in those blades 

 

I think, still trying to figure

[Stein K S]

3 hours ago, jakontil said:

The heat of the sun will break the lens vein that leads to leakage, hence the oil in those blades 

 

I think, still trying to figure

Jepp… and you do not have to commute to the sun to risk that… 😉

Edited October 14, 2022 by Stein K S

[Landiah]

On 10/12/2022 at 12:03 AM, jpto said:

I would vote for sending it in for a CLA/service. No firsthand experience but I've heard that oil on the blades means that lubrication/grease has broken down and the oil residue will eventually end up hazing the glass. Did you leave your lens in a hot car? 

No, the lens has been in a dry cabinet at room temp as long as I have owned it.

[skueh]

To avoid any oil leak or seeping onto the blades during storage, I normally set the aperture to the minima (f16 or f22). In this way, any oil leak will only get onto the base of the blades. 

For the photo posted by the poster I think the aperture was set at f2.4 or f4 during storage. The oil got onto the mid section of the blades.

Just my opinion.